Paper-making apparatus



May 30, 1933. P JACKSQN 1,912,341

PAPER MAKING APPARATUS Filed July '51, 1950 I N VEN TOR.

Maw {ZZZ m A TTORNEY.

Patented May 30, 1933 UNITED STATES PATENT OFFICE PERCY ANDREW JACKSON, OF I-IOLYOKE, MASSACHUSETTS, ASSIGNOR TO AMERICAN WRITING PAPER COMPANY, INC, 0F I'ZOLYOKE, MASSACHUSETTS, A CORPORATION OF DELAWARE PAPER-MAKING APPARATUS Application filed July 31,

This invention relates to improvements in paper-making apparatus, and is directed more particularly to apparatus known as heaters for preparing paper-making material.

The object of the invention is the provision of a beater apparatus for preparing papermaking material which by reason of the novel construction and arrangement thereof is efficient in its operation all to the end that production may be increased and the consumption of power reduced.

In order to facilitate a clear understanding of the novel features of the invention, reference will first be made to the common type of beater now in use. Such beaters include a tank or receptacle formed by upwardly eX- tending side walls and they are oval in shape or even circular. A central wall or midfeather extends through the middle of the tank and is spaced from the end walls so as to co-operate with the side walls and provide a continuous passageway around the tank. A roll is rotatable in the passageway and cooperates with a bed plate located in the lower or bottom wall of the passageway to receive therebetween and act on the paper-making material as it flows around and through the passageway. At the discharge side of the roll there is located a backfall which is spaced from the roll and as material passes beneath the roll it is forced upwardly by the action of the roll and over and along the surface of the backfall and against a circularly shaped cover or lid over the roll. Material is discharged by the roll with considerable force so that it strikes the cover and is thereby deflected or directed downwardly again thereby into the space, between the backfall and the roll as well as onto the roll itself. This action of the material impedes the proper discharge of the material and in fact may be said to set up a back pressure. For these reasons not only is the flow or discharge of material by the roll interfered with but the flow of ma terial from the roll around the passageway and back to the roll is more or less retarded. This unfavorably affects the production of the machine, and which in order to perform the work required of it consumes more power 1930. Serial No. 471,983.

and a; deflecting member inthe form ofa cover located thereabove which is constructed and arranged to cooperate with the backfall to direct the material away from the discharge side of the roll and forwardly towards the direction of flow of the material.

As a further feature a lower wall or surface of the beaterin the passageway is-constructed and arranged to co-operate with the backfall andfacilitates the free flow of the material through the passageway. In this way the material as it leaves the discharge side of the roll is directed away from the roll and up and over the backfall onto the lower wall of. the beater. By means of the invention material is caused to flow freely around and through the passageway, under the roll and up'over the backfall. The circulation of the material is not retarded with the result that the production of the machine is increased, while the power consumption thereof may be decreased.

The novel objects of the invention may be accomplished by the novel combination and arrangement of parts to be hereinafter more fully described and which for purposes of disclosure are illustrated in the form at present preferred by means of the accompanying drawing wherein: V

Fig. 1 is a plan view of a beater embodying the novel features of the invention.

Fig. 2 is a combined side elevational and sectional view of the beater shown in Fig. 1 on the line 22 of Fig. 1.

Fig. 3 is a transverse sectional view on the line 33 of 1, and

Fig. 4 is a similar transverse sectional View on the line44 of Fig.1.

Referring now to the drawing in detail the invention will be more fully described.

As shown in Fig. 1, a beater is provided which includes a vat or tank 2 formed by a. continuous vertically disposed wall or walls 3. The walls of the vat may be arranged to form an oval shaped tank or even a circular tank as may be desired. A shaft or spindle 4 extends across the upper side of the tank and is rotatably supported in suitable bearings 6 at the sides thereof. A pulley 8 on the shaft may be connected to any suitable source of power and a roll 10 on the shaft is arranged to co-operate with a bed plate 12 for receiving therebetween paper-making material which as it comes to the beater usually consists of a mixture of water and fibrous material. For

a beating operation the material passes between the roll and bed-plate as it is caused to flow or circulate around the tank by the action of the roll.

A mid-feather 14 or what I may call a central wall extends through the central portion of the tank and is spacedfrom the end walls so as to provide a continuous passageway around the tank.

According to this invention a backfall of novel form such as represented at 15 is provided in the passageway at one side of the roll 10. Its rear face is spaced from the roll 10 as at 16'to form a discharge'slot and as it nears theupper side 17 of the back fall is inclined forwardly as at 18, away from the roll.

The other or forward face of the backfall extends downwardly and forwardly away from the upper side 17 of the backfall as at 20. At the same time said face 20 declines transversely from the wall 3 at the outer side of the passageway towards the inner side or central wall member 14'. A cover indicated generally by 22 is disposed between the walls and over the roll 10 and has an upwardly and forwardly extending deflecting portion indicated by 24 which doubles back upon itself as at 25 so as to form what may be called a pocket indicated at 26. This pocket 26'is disposed to lie above the upper side of the backfall and forwardly thereof over the declining portion 20. a, I

As stated, the forward face 20 of the backfall declines from the upper side 17 thereof and also transversely from the outer to the inner side of the passageway. This decli nation is continued along the passageway, forwardly of the backfall, for some distance as shown more particularly in Fig. 2. This may be accomplished by inserts placed on the bottom wall of the passageway or said wall may be constructed to have the desired declination. This double declination of the backfall and bottomof the passageway facilitates the flow or circulation of material along the passageway.

The space 18 between the rear face of the backfall and the roll 10 which is referred to as a discharge slot increases in width by reason of the shape of the backfall and is in reality a diverging discharge orifice. As material passes under the roll and between the roll and bed plate into the discharge slot the .action of the roll is such that the material is thrown upwardly with some force through and out the discharge slot.

The material as it is discharged from the slot is thrown against the deflecting portion 24 of the cover and into the pocket. These are disposed and so arranged that the material is by the means thereof directed towards and onto the forward inclined surface 20 of the backfall. In this way the material is directed away from the space between the backfall and roll so as to not clog the slot or impede the free discharge of material. Also as material is directed onto the surface 20 it cleans the surface of any material lodging thereon and at the same time facilitates the circulation of the material around and through the passageway.

, By means of the novelconstructionit is possible to increase the production of the machine and at the same time reduce the power consumption thereof. This is because the roll may function in a normal manner for the V fiber reducingaction and is not required to overcome any back pressure brought about by the material being thrown back between the roll and the backfall.

Having described the invention 111 the form at present preferred, what I desire to claim and secure by Letters Patent of the United States is: 1

l. Thecombination in a beater of, a tub having an outer continuous wall and a central T 7 ward face of said backfall extending down-.

wardly and forwardly away from said ridge and declining transversely of said continuous passageway from said outer wall to said central wall, and a cover member disposed between said walls having a transverse side edge between and spaced from said roll and backfall below the plane of the ridge of the backfall and above the axis of the roll, a portion of said cover curved rearwardly from said transverse edge over said roll to form a continuous curved surface substantially concentric therewith and forming in co-operation with the surface of the roll a continuous unobstructed return passageway discharging downwardly at the rear side of the roll a portion extending upwardly and forwardly from said edge above said backfall to form with the rear face of the backfall a. continuation of said diverging discharge passageway and another portion extending downwardly fromsaid last-named portion to form a pocket disposed above the forward face of the backfall and forwardly of said ridge between the forward and rear faces thereof.

2. The combination in a heater of, a tub having an outer continuous wall and a central said wall spaced therefrom to form a continuous passageway around said central wall, a roll rotatable in said passageway, a backfall at the forward side of said roll having a rear face inclining upwardly and away from said roll co-operating with the surface thereof to form a diverging discharge passageway the said rear face terminating at a ridge below the a plane of the upper side of the roll, a forward face of said backfall extending downwardly and forwardly away from said ridge and declining transversely of said continuous passageway from said outer wall to said central wall, a cover member disposed between said walls having a transverse side edge between and spaced from said roll and backfall below the plane of the ridge of the backfall and above the axis of the roll, a portion of said cover curved rearwardly from said transverse edge over said roll to form a continuous curved surface substantially concentric therewith and forming in cooperation with the surface of the roll a continuous unobstructed return passageway discharging downwardly at the rear side of the roll, a portion extending upwardly and forwardly from said edge above said backfall to form with the rear face of the backfall a continuation of said diverging discharge passageway and another portion extending downwardly from said last-named portion to form a pocket disposed above the forward face of the backfall and forwardly of said ridge between the forward and rear faces thereof, and a ramp on the rear side of said roll inclining upwardly to the under side of said roll from the lower side of the passageway.

In testimony whereof I aflix my signature.

P. ANDREW JACKSON. 

